Alternatives to Littelfuse K2401F1
Littelfuse K2401F1 and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 K2401F1Littelfuse |  K2401GRPLittelfuse Inc. | K2401GLRPLittelfuse Inc. | +3more | |
|---|---|---|---|---|
| FFF Compatibility | The candidate is in a 2-lead axial DO-15 package, whereas the original K2401F1 is in a 3-pin TO-202 package.Axial leaded package versus a tabbed THT package.Matches all electrical specifications including the specialized Multipulse™ triggering characteristics for lamp ignitors. | Requires physical accommodation from TO-202 footprint to DO-15 axial package.Axial DO-15 form factor instead of a tabbed TO-202.Meets the 220V-250V breakover rating and offers superior ignition pulse generation performance. | ||
 AI Summary | K2401F1 by Littelfuse: Diac/Sidac Thyristor 220 ~ 250V TO-202. | This is the official axial replacement for the obsolete TO-202 K2401F1. It retains the same Multipulse™ characteristics and voltage ratings but requires lead bending or board adaptation to fit the original TO-202 footprint.
| This variant belongs to the same Multipulse™ series but features an optimized hold current of 30mA max (vs 150mA for the original). This enhances high-voltage pulse generation in ignition circuits while sharing the same axial DO-15 footprint as the standard K2401GRP.
| |
| Lifecycle Status | Obsolete | Active | Unknown | |
| Market Availability | Discontinued | In stock | Unknown | |
| REACH | Unknown | REACH | Unknown | |
| RoHS | RoHS | RoHS | Unknown | |
| Description | Diac/Sidac Thyristor 220 ~ 250V TO-202 | Diac/Sidac Thyristor 220 ~ 250V DO-15 | This variant belongs to the same Multipulse™ series but features an optimized hold current of 30mA max (vs 150mA for the original). This enh | |
| Manufacturer | Littelfuse | Littelfuse Inc. | Littelfuse Inc. | |
| Type | Thyristors | Thyristors | Component | |
| Datasheet | Open | Open | N/A | |
| Lead Time | Unknown | 14 weeks | Unknown | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8541.30.0080 | - | - | |
| Moisture Sensitivity Level | Not Applicable | - | - | |
| Package / Case | TO-202 Long Tab | - | - | |
| Current - Breakover | 10 µA | - | - | |
| Voltage - Breakover | 220 ~ 250V | - | - | |
| Current - Peak Output | 1 A | - | - | |
| Operating Temperature | -40°C ~ 125°C (TJ) | - | - | |
| Supplier Device Package | TO-202 | - | - | |
| Current - Hold (Ih) (Max) | 150 mA | - | - |
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Frequently asked questions
Yes. The Littelfuse K2401F1 is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the Littelfuse K2401F1 are the K2401GRP (Littelfuse Inc.) and the K2401GLRP (Littelfuse Inc.), out of 5 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the K2401F1 are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The K2401F1 (Littelfuse) is a part in the Thyristors category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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